Transducer configuration – Garmin GPSMAP 740s User Manual

Page 82

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78

GPSMAP 700 Series Owner’s Manual

Sonar

Transducer Configuration

Setting the Keel Offset

The keel offset compensates for the surface reading for the depth of a keel, making it possible to measure

depth from the bottom of the keel instead of from the transducer location. Enter a positive number to offset for

a keel. You can enter a negative number to compensate for a large vessel that may draw several feet of water.
1. Complete an action, based on the location of the transducer:

• If the transducer is installed at the water line

, measure the distance from the transducer location to

the keel of the boat. Enter this value in step 3 as a positive number.

• If the transducer is installed at the bottom of the keel

, measure the distance from the transducer to the

water line. Enter this value in step 3 as a negative number.

Keel Offset

2. From the Home screen, select Configure > My Boat > Keel offset.
3. Enter the distance measured in step 1. Ensure that you enter a positive or a negative number based on the

location of the transducer.

4. Select Done.
Setting the Water Temperature Offset

You must have a NMEA 0183 water-temperature sensor or a temperature-capable transducer to measure water

temperature.
The temperature offset compensates for the temperature reading from a temperature sensor.
1. Measure the water temperature using the temperature sensor or temperature-capable transducer that is

connected to the chartplotter.

2. Measure the water temperature using a different temperature sensor or a thermometer that is known to be

accurate.

3. Subtract the water temperature measured in step 1 from the water temperature measured in

step 2.
This is the temperature offset. Enter this value in step 5 as a positive number if the sensor connected to the

chartplotter measures the water temperature as being colder than it actually is. Enter this value in step 5

as a negative number if the sensor connected to the chartplotter measures the water temperature as being

warmer than it actually is.

4. From the Home screen, select Configure > My Boat > Temp offset.
5. Enter the temperature offset calculated in step 3.
6. Select Done.

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